Manual Bosch PWS 550 (page 18 of 115) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Spanish, Norwegian, Finnish)

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Preselect the required speed using the thumb

wheel 2 according to the table following the sec-

tion “Tool Specifications” (reference values).

■ Clamp the workpiece if it does not remain sta-

tionary due to its own weight.

■ Do not strain the machine so heavily that it

comes to a standstill.

■ Grinding and cutting discs become very hot

while working; do not touch until they have

cooled.

Rough Grinding

The best roughing results are

achieved when setting the machine

at an angle of 30° to 40°. Move the

machine back and forth with mod-

erate pressure. In this manner, the

workpiece will not become too hot,

does not discolour and no grooves

are formed.

Never use a cutting disc for roughing.

Flap Disc

With the flap disc (accessory), curved surfaces

and profiles (contour sanding) can be worked.

Flap discs have a considerably higher service life

than sanding sheets, lower noise level and lower

sanding temperatures.

Cutting

When cutting, do not press, tilt or

oscillate the machine. Work with

moderate feed, adapted to the ma-

terial being cut.

Do not reduce the speed of running

down cutting discs by applying

sideward pressure.

The direction in

which the cutting is

performed is impor-

tant.

The machine must

always work in an

up-grinding motion.

Therefore, never

move the machine in

the other direction!

Otherwise, the dan-

ger exists of it being

pushed uncon-

trolled out of the cut.

When cutting profiles and square pipes, it is best

to start with the smallest cross section.

Cutting Stone

■ The machine must be used only for dry

cutting/grinding.

It is best to use a diamond cutting disc. As a

safety measure against jamming, use the cutting

guide 17 with the special dust extraction protec-

tion guard.

Operate the machine with dust extraction only. In

addition, wear a dust mask.

The vacuum cleaner

must be approved for

the extraction of ma-

sonry dust.

Bosch provides suit-

able vacuum clean-

ers.

Switch on the ma-

chine and place the

front part of the cut-

ting guide on the

workpiece.

Slide the machine with moderate feed, adapted

to the material to be worked (Figure).

For cutting especially hard material, e. g., con-

crete with high pebble content, the diamond cut-

ting disc can overheat and become damaged as

a result. This is clearly indicated by circular

sparking, rotating with the diamond cutting disc.

In this case, interrupt the cutting process and al-

low the diamond cutting disc to cool by running

freely at no-load speed for a short time.

Noticeable decreasing work progress and circu-

lar sparking are indications of a diamond cutting

disc that has become dull. Briefly cutting into

abrasive material (e. g., lime-sand brick) can re-

sharpen the disc.

Speed Preselection

(PWS 8-125 CE/PWS 9-125 CE)

Operating Instructions

2 609 000 850.book Seite 7 Montag, 23. Januar 2006 9:16 09

18 • 2 609 000 850 • 06.01

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Bosch PWS 550 Manual

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